When accepting an offer TAs can indicate their availability.
Description
For a job, there can be an "Indicate availability" button after accepting an offer. The employer of course would have the option to include this or not.
Reasoning
Usually, after being offered a TA position, the employer asks for your availability. Instead of sending many emails the communication for this can happen through TAM. In addition, all the information for TA availability, for example, could be gathered in one place instead of multiple emails.
For thought
If this is implemented correctly, TAM could automatically make a plan for the weekly lab sessions based on the indicated availability and suggest it to the lecturer(s). This would be another issue of course.